Some hard numbers on the Android malware problem via Computer World reporter Gregg Keizer. As usual, take all reports from companies that sell anti-virus software with a grain of salt.

According to Lookout Security, which develops anti-malware software for Android but not for Apple's iPhone, the likelihood of an Android owner encountering malware has jumped by two-and-a-half times since January.

By June, between 1% and 5% of Android users -- the number varies by country -- had been infected by mobile malware, said Kevin Mahaffey, co-founder and CTO of San Francisco-based Lookout.

Mahaffey blamed a dramatic spike in malware targeting Android for improving hackers' odds. "In January, we saw only 80 unique pieces of Android malware, but by the end of June we tracked over 400," said Mahaffey.